We are doing a reno in our kitchen. It has popcorn ceiling. We would also like to add recessed lighting.
My question is about the vapour barrier. There is currently a 2mm vapour in attic. Can you add a vapour barrier below the existing drywall and add new drywall?
No, that would trap any moisture between both and become problematic quickly.
Agreed. One layer only. Can double the plastic layers but do not sandwich the drywall.
I've never heard or thought of doing that. So great question but the answer is no you cannot place vapour between the drywall. The 2 mil poly is garbage and it's not even close to being a true vapourbarrier that will hold heat in your home and the reverse hold the heat from coming in your home from the attic space. So mould needs a paper source to grow and placing the poly between the drywall will be leaving your attic space wide open for mould problems in the future. You need to remove drywall. 2 mil (sandwich wrap) accoustical seal the perimeter and poly ceiling with 6 mil poly / tape all seams. Then drywall re blowin attic space. Renos should only be done the right way or you'll regret and start all over a few years down the road.
Cheers,
BMUSCOTTY
Hi,
Rory from Compass Construction. Existing vapour barrier appears to be too light 2mm? Not a big job to install and replace barrier and drywall.
No adding an in-between layer will cause moisture to get trapped then mold sets in an causes way to many problems.
You can add blow in insulation to get r value to 50 or tear down re poly 6mm and re drywall.
No you would have to go back to the rafters and replace the vapour barrier. Depending on your attic you could look at spray foam on top as it will provide a vapour barrier.
Hi guys,
Thanks for the great advice. Looks like I'm taking down some drywall this week end.
Jim
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